[Found by way of Christian Weyer]
Finally here: thinktectureâ€™s Ingo Rammer and Richard Turner from Microsoft have published articles on performance comparisons of distributed application technologies
Performance of ASP.NET Web Services, Enterprise Services, and .NET Remoting
This is great stuff! I especially like the treatment of System.Messaging (which wraps MSMQ), as there hasn't been enough written about this great tool, and especially nothing (as far as I know) about metrics for it.